Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Oracle datetime query question

Posted on 2009-04-06
2
812 Views
Last Modified: 2013-12-19
A junior question: I have some records with the saved_date filed: 03/04/2009, but when I run below query, no result displayed:
select * from table_name where saved_date = to_date('03/04/2009','mm/dd/yyyy')

When I changed to:
select * from table_name where saved_date >= to_date('03/04/2009','mm/dd/yyyy')

Then the three records of that day is shown. Could anyone let me know why the second ">=" query only returns the record of particular date instead of all the records after that date and how I could get the date query for a particular date?

Thanks.
0
Comment
Question by:heyday2004
2 Comments
 
LVL 25

Assisted Solution

by:lwadwell
lwadwell earned 200 total points
ID: 24083468
Hi heyday2004,

there is possibly a time component in the field in the database - it is used in the comparison.  Hence the >= will return results as the TO_DATE() will return a date with a time of midnight a.m..  If you want to do an = test without time, try

select * from table_name where TRUNC(saved_date) = to_date('03/04/2009','mm/dd/yyyy')

lwadwell
0
 
LVL 74

Accepted Solution

by:
sdstuber earned 300 total points
ID: 24083881
the above query from lwadwell should work if you do have time in your value
but, if you have indexes on the saved_date column, I suggest writing the query like this instead.

select * from table_name where saved_date >= to_date('03/04/2009','mm/dd/yyyy') and saved_date < to_date('03/05/2009','mm/dd/yyyy')

using trunc on the column will negate the use of normal indexes
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Entering time in Microsoft Access can be difficult. An input mask often bothers users more than helping them and won't catch all typing errors. This article shows how to create a textbox for 24-hour time input with full validation politely catching …
When it comes to protecting Oracle Database servers and systems, there are a ton of myths out there. Here are the most common.
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
Via a live example, show how to take different types of Oracle backups using RMAN.

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question